Die shoe and guide for punch presses



Oct. 1, 1929. RUGGLES 1,729,898

DIE SHOE AND GUIDE FOR PUNCH PRESSES Filed Nov. 30; 1927 2 Sheets-Sheet1 K li 8 if /2 l3 1-?" x h 47.5 I; INVENTOR Q John Milton Rug; Les i \QRNEYS Oct. 1, 1929. J. M. RUGGLES 1,729,898

DIE SHOE AND GUIDE FOR PUNCH PRESSES Filed Nov. 30, 1927 2 Sheets-Sheet2 j @1011 M'Zz f 1072 u 65 BY@% Z7227 ATTORNEY 9 Patented Get. 1, 1929JOHN MILTON RUGGLES, OF THREE RIVERS, MICHIGAN DIE SHOE AND GUIDE FORPUNCH ERESSES Application filed November 30, 1927. Serial No. 236,645. 3

This invention relates to improved die shoes and guides for punchpresses.

The objects of the invention are:

First, to provide a die shoe and guide means for punch presses.

Second, to provide such a structure with means for automaticlubrication.

Further objects and objects pertaining to details and economies of myinvention will definitely appear from thedeseription to follow.

I accomplish the objects of my invention by the devices and meansdescribed in the following specification. The invention is clearlydefined and pointed out in the claims.

A device embodying my invention is clearly illustrated in theaccompanying drawing forming a part of this specification, in which Fig.1 is a front elevation view of my die shoe structure ready forattachment to a punch press.

Fig. 2 is a plan view of the parts appearing in Fig. 1 a portion of thefront extension of the upper shoe being broken away the conduits forlubricant being indicated by dotted lines.

Fig. 3 is avertical detail sectional view somewhat enlarged taken on theirregular line 33 of Fig. 2.

Fig. 4 is a detail sectional elevation view on line 4i of Fig. 2 throughthe guide pins and the pump, portions being shown in full lines.

Fig. 5 is an enlarged detail fragmentary sectional elevation through thepump taken on line 5-5 of Figs. 1, 2 and 4 portions being in full lines.

Fig. 6 is an enlarged detail transverse section on line 66 of Figs. 4and 5.

The parts will be identified by their numerals of reference which arethe same in all the views.

1 is the bottom or die shoe. 2 are slotted lugs for attaching the sameto the table of a punch press. 3 is the upper or punch shoecorresponding to the bottom shoe. 4 is the shank of the upper shoe forattachment to the ram of a punch press. 5 is the pump cylinder and 6 isthe pump piston of the lubricating pump.

11 is a front extension of the bottom or die shoe which is provided witha pair of guide or leader pins 12. These cooperate with the punch shoe 3which has forward extensions 31 each containing bushed guide bores 32 toengage and pass over the said guide pins 12. Around the base of eachguide pin 12 in shoe 1 is the trough 13 provided with a connectingtrough 14 which leads to the central Well 15 for the lubricant. Each pin12 has a central oil passage 16 to its upper end with lateral openings161 at the sides. The upper ends of the leader pins are beveled and thebushings are chamfered and receive the same.

The upright pump cylinder 5 is screw threaded into the bottom of thewell 15. (See Fig. 5.) The intake 51 of the pump is provided with pumpcheck valve 52 held in place by coiled spring 53 supported by the hollowscrew 54 and connects to the annular passage 56 which delivers throughapertures 501 into and from the bottom of the said cylinder 5.

6 is the piston or plunger having the piston rod 61 which projectsupwardly in position.

62 is a coiled spring in the base of the pump reacting to hold thepiston in the up position seen in Fig. 3. 7 is the tappet which is screwthreaded into a forwardly extending lug 33 on the shoe 3. The tappet 7is held in adjusted position by a lock nut 71 as seen in Figs. 1, 4 and5. The delivery of the pump is from passage 56 past check valve 57 whichis held in place by spring 58 and the hollow screw 59 and connects tothe discharge passage 17 connecting to the central bores 16 in eachleader pin 12.

The pump cylinder 5 is provided with oblique Vent apertures 502 at thetop and with relief apertures 503 at a point just below the lower end ofthe piston in its elevated position, see Fig. 5.

In operation it will be observed that the upper punch shoe 3 is liftedentirely independent of the lower shoe 2 and separate from the leaderguide pins 12. On the down stroke the tapper 7 strikes the piston rod 61forcing the piston down and forcing any lubricant within the pump outthrough the passage 17 up through the central bore 16 through thelateral apertures 161 to lubricate the upper end of each pin.

When the upper shoe is raised above the pins any oil on the upper end ofa pin will flow down the sides and lubricate the same completely andthoroughly. If there is much excess it will flow on down into the trough13. If adjusted to about the right point the oil will simply fiow overthe pin and be forced down by the bushing 32 when the punch shoe 3descends. The oil then flows readily back into the well 15 and iscirculated by the pump.

I provide a removable screen 8 over the lubricating portion of thebottom shoe, the same surrounding the piston rod 61 and the lower endsof the, leader pins.

The structure is capable of wide modification without departing from myinvention. A structure provided with a single leader pin would bedesirable. On the other hand more than two pins can be provided. Thepump shown is very simple. It could be modified.

Different kinds of valves are. available. The vents and reliefs might beomitted. The oil might be a continuous supply and notcirculated by avery close adjustment.

I desire to claim the precise structure which has special merit. I alsodesire to claim the invention broadly as pointed out in the appendedclaims. I I

Having thus described my invention what I claim as new and desire tosecure by Letters, Patent is:

1. The combination with a bottom or die shoe, of means for attaching itto the table of a punch press, front projections on said die shoe withleader pins supported therein, having vertical central oil passagesleading from near the bottom to the top thereof, with lateral aperturesnear the top, a central lubricant well between said pins, an uprightpiston pump in said well, with an upwardly.- projecting piston rod, areturn spring beneath the said piston, an intake passage. containingcheck valves between the pump and well, a discharge passage leadingtherefrom and passages leading to the central bores in said leader pins,an upper or .die shoe with forward projections with bores to cooperatewith said leader pins, a forward projection with an adjustable tappetdisposed to act upon and depress the pump piston rod when in loweredposition, all coacting substantially as described for the purposespecified.

2. The combination with a bottom or die shoe, of means for attachingitto the table of a punch press, front projections on said die shoe withleader pins supported therein, having vertical central oil passagesleading from near the bottom tothe top thereof, a central lubricant wellbetween said pins, an upright pisto-npump in said well, with anupwardlyprojecting piston rod, a return spring beneath the said piston,intake passage containing check valves between the pump and well, adischarge passage leading therefrom, and passages leading to the centralbores in said leader pins, an upper or die shoe with forward projectionswith bores to cooperate with said leader pins, a forward projection withan adjustable tappet disposed to act upon and depress the pump piston,rod when in lowered position, all coacting substantially as describedfor the purpose specified.

3. The combination with a bottom or die shoe provided with a leader pinhaving an oil bore therethrough with lateral apertures near the top, ofan upright pump with a projecting piston, a return spring for holdingthe piston upward, an upper or punch shoe with a bore for cooperationwith the said leader pin, a. tappet carried by said upper die shoepositioned to cooperate with said projecting pump piston, and an oilpassage to the leader pin to deliver oil when the die is depressed, asspecified.

l. The combination with a bottom or die shoe provided with leader pinhaving an oil bore therethrough, an upright pump with a projectingpiston, a return spring for holding the piston upward, of an upper orpunch shoe with a bore for cooperation with the said leader pin, atappet carried by said upper die shoe positioned to cooperate with saidpro ecting pump piston, and an oil pie 1 sage to. the leader pin todeliver oil when the die. is depressed, as specified.

5. The combination with a bottom or die. shoe, of an upright leader pinhaving an oil bore therethrough, an upper or punch shoe with a bore forcooperating with said leader pin, and an oil pump operated by themovement of said upper shoe. for delivering oil tov the leader pin, asspecified.

In witness whereof I have hereunto set my hand.

JOHN MILTON RUGGLES.

